Doctor-vibrating device for paper-machines.



H.-F. D-UNBAR.

DOCTOR VIBRATING DEVICE FOR PAPER MACHINES.

' APPLICATION FILED APR-9. 1914.

2 SHEETSSHEET I.

WITNESSES: 1N VEN TOR.

A TTORNE Y3 H. F. DUNBAR. DOCTOR VIBRATING DEVICE FOR PAPER MACHINES.

APPLICATION EIL ED APR. 9 1914.

Patented Aug. 17, 1915.

2 SHEETS-SHEET 2 I INI/I'ENTOR. I

ATTORNE Y5 W)U V E MP .W

HAROLD F. DUNBAR, OF TURNEBS FAILS, MASSACHUSETTS.

DOGTOKVIBRATING- DEVICE FOR, PAPER-MACHINES.-

Specification of Letters ratent.

Application filed Apri19, 1914. Serial No. 830,666.

' Paper-Machines, of which the following is a specification.

This invention relates to improvements in paper making machines. I

An object of the invention is to provlde a construction by means of which the doctor,

. so called, can be readily vibrated back and forth.

Broadly, the invention consists in means for connecting this member to a suitable moving part of the machine and also to provide means whereby it may readily be osc llated about its own axis to engage and (11S- engage the press or other roll of the machine.

Referring to the drawings, Figure 1 is a side elevation showing in general the connecting means between one of the top press rolls and the mechanism by means of which the doctor is vibrated or reciprocated back and forth. This view also shows the doctor member in end elevation. Fig. 2 is a top plan.view of the, invention illustrated -m Fig. 1, clearly showing the means by which the doctor member can be vibrated or reciprocated longitudinally of the roll whlch it engages, also the connecting means between the press roll and the mechanism for actuating the doctor. Fig. 3 is a vertical sectional view on the line 3-3 of Fig. 2, showing the internal construction of the oil tight box which incloses the operating mechanism, also clearly illustrating the ball and socket connection between the doctor and the connecting rod which is operated from the driving shafts.

Referring to the drawings in detail: 1 designates a roll of the paper making machine, preferably one of the top press rolls, although the invention is not limited to any particular roll of the machine. Secured to the shaft 2 of this roll is a sprocket-gear 3 around which passes a sprocket chain 4 that drives the s rocket wheel 6 that is secured to a shaft '?that extends through the oil tight casing 8. A bevel gear 9 is secured at the inner end thereof of the shaft 7 This gear meshes with a second bevel gear 10 which is secured to a vertical shaft 11,'the

lower end of which shaft is set into a bearing 12, the upper end of the shaft passing through a bearing 13, which is located in the cover 14 of the casing 8. This casing as stated is filled with oil, preferably to thoroughly lubricate the gears 9 and 10 and also to render them noiseless. Pivotally attached to the shaft 11, by means of the crank pin 15, is a connecting rod 16 that is formed with a ball 17 on its outer end.

This ball enters a corresponding shaped recess 18 in the head portion 18 of the extension 19 which is connected to doctor member 20. The extension 19 is held in place by the cap 19.

21 is an end cap that is also formed with a spherical shaped recess corresponding in shape with the recess 18 and this cap is bolted to the head portion 18 of the extension member 19 by means of the bolts 22.

23 designates a cap or closure for the easing 8. It is secured to the upper end of this casing and in fact forms acover for the connecting rod 16 and its pivotal connection to the shaft 11.

24 indicates the rear or apron portion of the doctor to retain the collected material in place on the blade.

24 is an arm that is rigidly secured to shaft 19 of the doctor 20 by means of which this member can be raised out of contact with the press roll 1 whenever desired. It is held down on the roll 1 by means of a Weight as. 4

21 designates the portion of the doctor that engages the roll 1. This portion is usually made of brass, rubber, or any suitable material.

It will be understood that the rate of vibration of the doctor is determined solely by the relative sizes of the sprocket gears 3 and 6. In this construction it will be seen that I have provided a device that is simple in construction, one that can be operated with the least amount of power, also one by means of the ball and socket joint construction, which will permit the doctor to be rolled or lifted by means of the handle 24 about its axis independently of the operating mechanism for the purpose of cleaning or for other purposes. It will also be seen from the description of this construction that the present improvement does not allow the doctor blade to remain in any one position long enough on the press roll to cause scratches or any unevenness in the surface of the roll. It is PatemtedAug. it, 11ers.

of course understood that at the end of the travel of the vibrator or longitudinal motion of the doctor the lade must necessarily change in direction, but as this interval is so short there is no possibility of any scratches or grooves being worn into the surface of the press roll.

'A suitable pipe for filling the casing with oil is indicated at 25, oil holes are shown at 26 to permit the oil to rise above the plate 14 in order to thoroughly lubricate all of the moving parts. A grease cup is shown at 27, for lubricating the ball and socket joint, and a drip ring at 28 to prevent the oil from following along the connecting rod 16.

It is clear that the number of vibrations imparted to the doctor blade depends upon engage said roll, means to reciprocate said.

blade, comprising a pair of gear wheels, a sprocket chain to en age the wheels, a shaft operable from one 0 said wheels, a connecting rod attached at one of its ends to said shaft and to said doctor at its othervend, the

last mentioned attachment including a ball and socket joint construction, as described, whereby said blade may be moved transversely to its reciprocating movements.

HAROLD F. DUNBAR.

Witnesses:

H. L. HOLDSWORTH, A; M. BITZER. 

